JPH07501503A - bus system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] bus system The invention relates to a bus system according to the preamble of claim 1 . This kind of bar Multiple control devices that must exchange data with each other via a It is connected. When used in vehicles, this type of control device can be used, for example, with anti-lock systems. Control unit for stem (ABS) and anti-slip adjustment unit (ASR), engine system control section, electronic transmission control section, airbag control section, etc.

The known bus system is designed to accommodate the increasing number of individual cable connections in vehicles. Conference Proceedings C205/851. Mech, E1985, pp. 227-230'P roposal for an auto@otive multiplex wiring system’), the serial bus is an independent control device (engine system). control section, dash board computer) as well as modules controlled by the central control section. Connect modules to each other. The central control unit controls the overall information input/output and further , perform special tasks (time generation, data storage, signaling). distributed across vehicles The installed modules are connected to the signal input side (switches, sensors) on the one hand and and signal output side (driver circuit for lamp, engine and actuator) and , is the interface between the bus on the other hand. Data transmission is always centrally It is done through a computer.

One of the control devices receives data that is evaluated over relatively long time intervals, e.g. When a meter needs data to be processed, it can store these itself in each case. must be calculated according to individually stored algorithms.

This makes the required programs in the individual control devices large and therefore Often statistical functions and processes, such as adaptation processes, are Although it is useful, it cannot be implemented.

The task of the invention is to combine all signals available on the bus with additional important measurement signals. processing and possibly storing the signal and time data for long-term evaluation. That is. This object is solved by a bus system according to claim 1 .

Advantageous embodiments of the invention are set out in the further claims.

The advantage of the invention is, in particular, that the data modules of the bus system can be freely preconfigured. Even if you follow processes and methods, e.g. fuzzy logic methods, Generates statistical data and transmits them as multiplexed data words over the bus. cyclically and thus to all connected devices, so-called bus subscribers. The point is to make it more layered.

Next, embodiments of the present invention will be described based on the drawings.

In the figure, FIG. 1 is a schematic diagram of the bus system of the present invention, and FIG. 2 is a schematic diagram of the bus system of FIG. is a block diagram of the system's data module, FIG. 3 is a diagram illustrating one possible configuration of data processed on the bus, FIG. 4 shows a so-called communication matrix for a given bus system.

A bus system 1 comprises a plurality of control devices 2 interconnected by a serial bus 3. have. Known examples of buses of this type are so-called vehicle buses, VAN buses and CA This is the N bus. On bus 3, all data added to the bus and additionally The important constant values supplied via the data line 7 from various sensors S in the vehicle are A data module 4 for detection is also connected. These data and measurements? In data module 4, statistically, taking into account the date and clock time, The processed data is displayed. Here, statistical processing of data refers to detection of data and measurements over defined time intervals and these data It is a value derived from, for example, the average value.

The statistical data can be obtained, for example, according to the fuzzy logic method, as described above. You can use it.

They are useful for the control device, in which they can be adapted and Can be used for optimization methods. However, they are limited to individual control devices. Greenhouse signals and their processing must be done in real time, and these controls Unlike control signals sent from equipment, strict time requirements are placed on No, that is, it is non-critical.

The statistical data is sent as multiplexed information from the data module 4, i.e. is transmitted cyclically in the form of a time-division multiplexed signal and thereby controls all control devices. 2 (see also the description of FIGS. 3 and 4).

An indication unit, for example in the form of a light display or an alarm gong, is provided in the bus system 1. 5 can also be connected. Through these, evaluated by data module 4 A data module 4 (Fig. 2) to which an instruction signal generated from the data is sent out. includes a computing unit 6, for example a microcomputer or a microcontroller. and multiple input/output lines are connected to it.

Via line 8.9 and lO, digital input signals, analog input signals or For example, a frequency signal from a rotational speed generator reaches the data module 4. From bus 3, All data transmitted on the bus are sent to data module 4 as input signals. reach In other words, the statistically valid data collected in the data module is , is sent out as a multiplexed output signal via the bus. Multiple line or bus The line 11, which can be formed by Ru.

Bus 3 and lines 8 to 11 each carry a matching or interface circuit 12. via which it is connected to the calculation unit 6. All shown in 12 for simplicity As is well known, in these matching circuits, level conversion, AD conversion, etc. Implemented. On the output lines they typically include driver circuits.

The data module 4 can be realized as an independent control device, which It can be stored in a computer and it is a form of stored algorithm. may be included in any other control device.

The current supply is provided by a 1.15 or K1 terminal on the on-board power supply, not shown here. ．． This is done via 30.

The computing unit or microcontroller 6 further includes a memory module 13; For example, an EEPROM and a clock module 14 are connected.

In addition to the above-mentioned detection of statistical data in the data module, the known bus In the system, for example ABS or A Data such as the reference speed for the SR$ control unit can also be stored.

Possible output data of data module 4 are the following: clock time, date, Seasons (numbered from 1 to 4), outside temperature, altitude-dependent barometric pressure, rain or snow identification signals, road condition signals, driver identification signals, and driver driving style. Signals to be commanded (sport driving, economical driving, restrained driving), driving time and stopping time Percentage display of the driving cycle, i.e. of driving, outparns, roads and and city percentage display, traffic jam identification signal, and monthly kilometers traveled. data (such data for the current month and previous months), measurements maximum speed, average speed, average consumption, number of starts per month, etc.

The formation of data in a bus system with the example of a customary vehicle bus is implemented as follows. (FIG. 3), from data module 4 to bus 3, respectively 2 to 6 buses. Messages or message blocks consisting of items are sent out cyclically. 1st bytes or words (=2 bytes) 17 are transmitted from l to a maximum number n. It includes a transmit cycle counter that continuously counts the number of data words. Second byte also The word 18 and the third byte or word (not shown here) are sent out. information that should be processed by the data module, i.e. general or statistical. Contains the data that will be displayed.

As an example of this type of data, in Figure 3, the clock time and date data described above are shown. , driver identification signal, kilometers traveled per month and traffic congestion identification signal are shown. Communication consisting of 2 to 6 bytes is also called valid object data. .

In the CAM path, the data transmission rate is, for example, 125 kilobaud. Regarding transmission time Since non-critical data is handled, when repeating Looms transmission. between is sufficient. If a large amount of data is transmitted every 30 seconds, the maximum 00 valid information can be transmitted. That is, 30x 1000m5゜ 7100m5. This is because =300.

For the bus, information is connected to the bus by a so-called information exchange matrix (Figure 4). It is not determined which devices in the system will send out or receive what data. It will be done. The information exchange matrix is shown here as an example for three devices. In this case, the device 3 sends out statistical data, i.e. it is a data module. Ru.

The device, together with the data sent each time, forms a so-called object, which So device 1 is data l.

l to 1. Together with n, an object l is formed, and so on. each The device is assigned an identification code, a so-called identifier: the device l is assigned an identifier IDI. device 2 is assigned identifier 2, and device 3 (data module 4) is assigned identifier 2. An identifier ID3 is assigned, and so on.

Data to be sent is indicated by a lowercase S in the information exchange matrix and is The data taken is indicated by a lowercase e.

Therefore, in a very small number of memory cells of bus 3, a maximum number n of temporal Non-critical data can be used by all bus subscribers.

Transmission of input signals on bus 3 and control device 3 (e.g. engine control or valve) The exchange of communication signals between the controllers) is not performed in the manner described here. This rice is transmitted via the bus 3 at a relatively high transmission rate in a known manner. . They require significantly greater transmission capacity. However, the transmission capacity depends on these Data that is not time-critical because not all of it will be used can be transmitted almost in parallel. Furthermore, according to the method described above, optical Or acoustic monitoring and instructional data can be transmitted.

,+,,,-,=,-=　PCT/εP　92102676 International Search Report

Claims (6)

[Claims] 1. It has a bus that keeps the plurality of landing gear systems (2) secret from each other and transmits information on the bus. e.g. in a bus system in a vehicle, where the data to be analyzed is evaluated in a central unit. In (1), The device is configured as a data module (4), the data module The data transmitted on the bus (3) is read out and time-critical information is generated from Said information is transmitted over the bus (3) as messages with a low transmission repetition frequency. and the said information is sent out as necessary by the individual control device (2). removed from the bus A bus system characterized by 2. In the data module (4), the data is supplied from a sensor (7) in the vehicle. data is evaluated The bus system according to claim 1. 3. In said data module (4) an optical or acoustic indicating unit (5) instruction data is generated that is sent out via The bus system according to claim 1. 4. The message includes a first byte or word representing a transmit cycle counter; Claim 1 comprising one to four separate bite bees containing information to be performed. bus system. 5. The data module (4) is a component of an onboard computer. The bus system according to claim 1. 6. The entire information generated by said data module (4) takes 30s of time. sent out via said bus (3) each time within an interval. The bus system according to claim 1.